50 Unforgettable Photos of Muhammad Ali

Muhammad Ali, born Cassius Clay in 1942, was arguably the greatest boxer of all time. Ali passed away Saturday at the age of 74. Here we take a look back at some of the most powerful, memorable, fascinating photos of him ever captured.

1954, age 12.

AP

1962, with trainer Angelo Dundee at City Parks Gym in New York.

APDan Grossi

1963, holding up three fingers to show his prediction for how many rounds his opponent Charlie Powell will fall in, in Pittsburgh, Pennsylvania.

Marvin Lichtner/Pix Inc./The LIFE Images Collection

1963, in London, England.

Alamy

1963, in London, England.

Alamy

1963, shadowboxing in his family's home in Louisville, Kentucky.

Steve Schapiro

1963, holding a pair of mini-boxing gloves at his family's home in Louisville, Kentucky.

GettySteve Schapiro

1964, battling for heavyweight champion of the world against Sonny Liston in Miami, Florida.

AP

1964, following his victory over Sonny Liston, which made him the new heavyweight champion of the world.

AP

1964, celebrating in Miami, Florida following his defeat of Sonny Liston.

GettyBob Gomel/The LIFE Images Collection

1964, from that same night post-heavyweight championship win with Malcom X (R) in Miami, Florida.

GettyBob Gomel/The LIFE Images Collection

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1964, joking around with the Beatles (from left to right, George Harrison, Ringo Starr, John Lennon and Paul McCartney) in Miami, Florida.

GettyChris Smith/Popperfoto

1965.

Harry Benson

1965, in San Juan, Puerto Rico.

GettyBrian Hamill

1965, with his family in Louisville, Kentucky.

Alamy

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1965, reading through fan mail with his mother, Odessa in Louisville, Kentucky.